JLG T350 Service Manual - Manual (Page 50)

SECTION 3 - CHASSIS & TURNTABLE
3-14 – JLG Lift – 3121198
3.8 COMBINATION COUPLER
THE WEIGHT RATING OF THE COUPLER IS DEPENDENT UPON
THE CORRECT BOLTS BEING USED. USE THE BOLTS PROVIDED
WITH THE COUPLER. IF BOLTS ARE MISSING, REFER TO THE
PARTS MANUAL AND OBTAIN REPLACEMENT BOLTS OR USE
THE EXACT SIZE, GRADE, AND NUMBER OF BOLTS AS SPECI-
FIED. USING THE WRONG SIZE, GRADE, OR NUMBER OF BOLTS
WILL REDUCE THE WEIGHT RATING OF THE COUPLER AND
COULD CAUSE SEPARATION OF THE MACHINE FROM THE TOW
VEHICLE.
Bleeding the Brake System
1. Remove the bolts and lockwashers that hold the
lever guide and flat emergency lever spring.
2. Remove the lever guide and emergency lever
spring. Using short strokes, pull forward on the
emergency lever, pumping the master cylinder until
brake fluid within the master cylinder stops bub-
bling.
3. Attach a bleeder hose to the bleeder valve on one of
the wheels and submerge the other end of the hose
into a transparent container partially filled with brake
fluid.
4. Loosen the bleeder valve one turn, and while watch-
ing the hose in the container, use the emergency
lever to pump the master cylinder as long as air bub-
bles continue to leave the hose. When bubbles stop,
close the bleeder valve and repeat the process on
the other wheel.
NOTE: Check the fluid level in the master cylinder frequently
while bleeding the brakes. Refill as necessary.
5. Once bleeding is completed, refill the master cylin-
der and attach the cap securely.
6. Replace the emergency lever spring, lever guide,
lockwashers, and bolts.
7. Test the brakes by pulling the emergency lever for-
ward until it locks into its second notch position (the
lever should be approximately straight up).
8. Attempt to rotate the wheels in a forward direction. If
any wheels rotate, the brakes must be adjusted. To
adjust the brakes, release the emergency lever from
the locked position, set each wheel’s brake adjust-
ment up 2 or 3 notches.
9. Repeat the test procedure as necessary.
General Maintenance
1. Frequently check brake fluid level. Fluid must be
approved, clean, and uncontaminated.
2. Make sure actuator mounting bolts are secure.
3. Inspect the actuator and replace any bent, worn, or
damaged parts.
4. Be constantly aware of the system’s braking quality,
make periodic checks. Consult a certified brake spe-
cialist to make necessary adjustments or repairs.
Servicing the Emergency Lever
If the emergency lever of the actuator is applied, it can be
disengaged by using a screwdriver to lift upward on the
front of the flat emergency lever spring while pulling the
lever forward until it is released. A thorough inspection of
the emergency lever, emergency lever spring, and cable
with S-hooks is required. Damaged parts must be
replaced as outlined below:
1. Remove the master cylinder and push rod assembly.
Be careful not to get dirt into the master cylinder. A
new master cylinder gasket should be used when
reinstalling the master cylinder.
2. Remove the cable S-hook from the emergency lever,
emergency lever guide and flat emergency lever
spring, then pull the lever out of the actuator outer
case through the cross-slot in the top.
3. Install the new emergency lever through the cross-
slot in top of the outer case. Attach a new emer-
gency lever spring and emergency lever guide.
4. Insert the S-hook on the emergency cable into the
hole in the emergency lever and squeeze shut.
5. Add adequate brake fluid to the master cylinder and
bleed the brake system.